Le source: SchemaGLUPerspective.cpp
/* Auteur: Nicolas JANEY */
/* nicolas.janey@univ-fcomte.fr */
/* Juin 2001 */
/* Schema d'utilisation de la fonction */
/* OpenGL gluPerspective */
#include <stdio.h>
#include <math.h>
#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include "ModuleCouleurs.h"
#include "ModuleReshape.h"
#include "ModuleManipulateur.h"
#include "ModuleMenus.h"
#include "ModuleFont.h"
#include "ModuleFleche.h"
typedef float vecteur[4];
static float g;
static float d;
static float b;
static float h;
static float cmin = 5.0F;
static float cmax = 10.0F;
static float ouverture = 30.0F;
static float ratio = 1.333F;
void myinit(void) {
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
glEnable(GL_ALPHA_TEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
glClearColor(1.0F,1.0F,0.9F,0.0F);
}
void axes() {
setFont(GLUT_BITMAP_8_BY_13,CENTER);
glColor4fv(couleurRouge());
flecheEnVolume(1.0F,0.0F,0.0F,0.1F,0.3F,0.02F);
glColor4fv(couleurVert());
flecheEnVolume(0.0F,1.0F,0.0F,0.1F,0.3F,0.02F);
glColor4fv(couleurBleu());
flecheEnVolume(0.0F,0.0F,1.0F,0.1F,0.3F,0.02F);
glPushAttrib(GL_DEPTH_TEST);
glDisable(GL_DEPTH_TEST);
glColor4fv(couleurRougeFonce());
bitmapStringOutput(1.3F,0.0F,0.0F,"x");
glColor4fv(couleurVertFonce());
bitmapStringOutput(0.0F,1.3F,0.0F,"y");
glColor4fv(couleurBleuFonce());
bitmapStringOutput(0.0F,0.0F,1.3F,"z");
glPopAttrib();
}
void recalculParametres() {
float t = tan(ouverture*3.14159/360);
h = t*cmin;
b = -t*cmin;
g = b*ratio;
d = h*ratio;
}
void dessineOuvertureVerticale() {
float r =(float) sqrt(cmin*cmin+h*h);
glBegin(GL_LINE_STRIP);
for ( int i = 0 ; i <= ouverture ; i++ ) {
double angle = (-ouverture/2+i)*3.14159/180;
glVertex3f(0.0F,r*sin(angle),6.0F-r*cos(angle)); }
glEnd();
setFont(GLUT_BITMAP_9_BY_15,LEFT);
double angle = -ouverture*0.375*3.14159/180;
bitmapStringOutput(0.0F,r*sin(angle),6.0F-r*cos(angle),"foc");
}
void dessineOuvertureHorizontale() {
float r =(float) sqrt(cmin*cmin+g*g);
double ouv = atan2(d,cmin);
int n =(int) (2*ouv*180/3.141459);
glBegin(GL_LINE_STRIP);
for ( int i = 0 ; i <= n ; i++ ) {
double angle = (-ouv+i*2*ouv/n);
glVertex3f(r*sin(angle),0.0F,6.0F-r*cos(angle)); }
glEnd();
setFont(GLUT_BITMAP_9_BY_15,LEFT);
double angle = ouv*0.375;
bitmapStringOutput(r*sin(angle),0.0F,6.0F-r*cos(angle),"foc*ratio");
}
void display(void) {
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
recalculParametres();
glPushMatrix();
manipulateurSouris();
manipulateurClavier();
glEnable(GL_CULL_FACE);
glColor4fv(couleurRose(0.2F));
float fact = cmax/cmin;
glBegin(GL_QUADS);
glVertex3f(g*fact,h*fact,6.0F-cmax);
glVertex3f(d*fact,h*fact,6.0F-cmax);
glVertex3f(d*fact,b*fact,6.0F-cmax);
glVertex3f(g*fact,b*fact,6.0F-cmax);
glEnd();
glBegin(GL_QUADS);
glVertex3f(g*fact,b*fact,6.0F-cmax);
glVertex3f(g,b,6.0F-cmin);
glVertex3f(g,h,6.0F-cmin);
glVertex3f(g*fact,h*fact,6.0F-cmax);
glEnd();
glBegin(GL_QUADS);
glVertex3f(d*fact,h*fact,6.0F-cmax);
glVertex3f(d,h,6.0F-cmin);
glVertex3f(d,b,6.0F-cmin);
glVertex3f(d*fact,b*fact,6.0F-cmax);
glEnd();
glBegin(GL_QUADS);
glVertex3f(g*fact,h*fact,6.0F-cmax);
glVertex3f(g,h,6.0F-cmin);
glVertex3f(d,h,6.0F-cmin);
glVertex3f(d*fact,h*fact,6.0F-cmax);
glEnd();
glBegin(GL_QUADS);
glVertex3f(d*fact,b*fact,6.0F-cmax);
glVertex3f(d,b,6.0F-cmin);
glVertex3f(g,b,6.0F-cmin);
glVertex3f(g*fact,b*fact,6.0F-cmax);
glEnd();
glDisable(GL_CULL_FACE);
glClear(GL_DEPTH_BUFFER_BIT);
glColor4fv(couleurBleuCiel(0.5F));
glBegin(GL_QUADS);
glVertex3f(g,b,6.0F-cmin);
glVertex3f(d,b,6.0F-cmin);
glVertex3f(d,h,6.0F-cmin);
glVertex3f(g,h,6.0F-cmin);
glEnd();
glClear(GL_DEPTH_BUFFER_BIT);
glColor4fv(couleurBleu());
setFont(GLUT_BITMAP_8_BY_13,CENTER);
bitmapStringOutput(0.0F,h/2,6.0F-cmin,"ecran");
bitmapStringOutput(0.0F,-0.5F,4.0F,"axe de visee");
glPushMatrix();
glTranslatef(0.0F,0.0F,6.0F);
flecheEnVolume(0.0F,0.0F,-4.0F,0.1F,0.3F,0.03F);
glPopMatrix();
glColor4fv(couleurRouge());
placeFontCursor(d/2,h*(1+fact)/2,6.0F-(cmin+cmax)/2) ;
bitmapStringOutput("volume de");
deplacementCursor(0,13,0);
bitmapStringOutput("visualisation");
glColor4fv(couleurNoir());
setFont(GLUT_BITMAP_9_BY_15,CENTER);
bitmapStringOutput((d*fact)+2.0F,-0.3F,6.0F-cmin,"-cmin");
bitmapStringOutput((d*fact)+2.0F,-0.3F,6.0F-cmax,"-cmax");
glColor4fv(couleurRouge());
glLineWidth(2.0);
glBegin(GL_LINE_LOOP);
glVertex3f(g,b,6.0F-cmin);
glVertex3f(d,b,6.0F-cmin);
glVertex3f(d,h,6.0F-cmin);
glVertex3f(g,h,6.0F-cmin);
glEnd();
glBegin(GL_LINE_LOOP);
glVertex3f(g*fact,b*fact,6.0F-cmax);
glVertex3f(d*fact,b*fact,6.0F-cmax);
glVertex3f(d*fact,h*fact,6.0F-cmax);
glVertex3f(g*fact,h*fact,6.0F-cmax);
glEnd();
glBegin(GL_LINES);
glVertex3f(g,b,6.0F-cmin);
glVertex3f(g*fact,b*fact,6.0F-cmax);
glVertex3f(d,b,6.0F-cmin);
glVertex3f(d*fact,b*fact,6.0F-cmax);
glVertex3f(d,h,6.0F-cmin);
glVertex3f(d*fact,h*fact,6.0F-cmax);
glVertex3f(g,h,6.0F-cmin);
glVertex3f(g*fact,h*fact,6.0F-cmax);
glEnd();
glLineWidth(1.0);
glEnable(GL_LINE_STIPPLE);
glLineStipple(1,0x5555);
glBegin(GL_LINES);
glVertex3f(0.0F,0.0F,6.0F);
glVertex3f(1000*d,1000*b,6.0F-1000*cmin);
glVertex3f(0.0F,0.0F,6.0F);
glVertex3f(1000*d,1000*h,6.0F-1000*cmin);
glVertex3f(0.0F,0.0F,6.0F);
glVertex3f(1000*g,1000*b,6.0F-1000*cmin);
glVertex3f(0.0F,0.0F,6.0F);
glVertex3f(1000*g,1000*h,6.0F-1000*cmin);
glColor4fv(couleurBleu());
glVertex3f(0.0F,0.0F,-10000.0F);
glVertex3f(0.0F,0.0F,10000.0F);
glColor4fv(couleurNoir());
glVertex3f(0.0F,0.0F,6.0F-cmin);
glVertex3f((d*fact)+1.8F,0.0F,6.0F-cmin);
glVertex3f((d*fact)+1.5F,-0.3F,6.0F-cmin);
glVertex3f((d*fact)+1.5F,0.3F,6.0F-cmin);
glVertex3f(0.0F,0.0F,6.0F-cmax);
glVertex3f((d*fact)+1.8F,0.0F,6.0F-cmax);
glVertex3f((d*fact)+1.5F,-0.3F,6.0F-cmax);
glVertex3f((d*fact)+1.5F,0.3F,6.0F-cmax);
glVertex3f((d*fact)+1.5F,0.0F,-10000.0F);
glVertex3f((d*fact)+1.5F,0.0F,10000.0F);
glVertex3f(1.0F,0.0F,6.0F);
glVertex3f((d*fact)+2.8F,0.0F,6.0F);
glEnd();
dessineOuvertureVerticale();
dessineOuvertureHorizontale();
glDisable(GL_LINE_STIPPLE);
glPushMatrix();
glTranslatef(0.0F,0.0F,6.0F);
axes();
glPopMatrix();
glPopMatrix();
glFlush();
glutSwapBuffers();
}
void key(unsigned char key,int x,int y) {
if ( keyManipulateur(key,x,y) )
glutPostRedisplay();
else
switch ( key ) {
case 'o' : ouverture += 1.0F;
if ( ouverture > 88.0F )
ouverture = 88.0F ;
glutPostRedisplay();
break;
case 'O' : ouverture -= 1.0F;
if ( ouverture < 0.0F )
ouverture = 0.0F ;
glutPostRedisplay();
break;
case 'r' : ratio *= 1.02F;
glutPostRedisplay();
break;
case 'R' : ratio /= 1.02F;
glutPostRedisplay();
break;
case 'i' : cmin += 0.1F;
glutPostRedisplay();
break;
case 'I' : cmin -= 0.1F;
glutPostRedisplay();
break;
case 'a' : cmax += 0.1F;
glutPostRedisplay();
break;
case 'A' : cmax -= 0.1F;
glutPostRedisplay();
break; }
}
int main(int argc,char **argv) {
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGBA|GLUT_DEPTH);
glutInitWindowPosition(10,10);
glutInitWindowSize(400,250);
glutCreateWindow("Schema: Fonction OpenGL gluPerspective");
myinit();
creationMenuBasique();
setParametresOrthoBasique(-4.5,4.5,-4.5,4.5,-500.0,500.0);
setManipulateurDistance(1.0F);
setManipulateurClavierAngle(16.0F,-48.0F,0.0F) ;
glutReshapeFunc(reshapeOrthoBasique);
glutKeyboardFunc(key);
glutSpecialFunc(specialBasique);
glutMotionFunc(motionBasique);
glutMouseFunc(sourisBasique);
glutDisplayFunc(display);
glutMainLoop();
return(0);
}
/* ************************************************** */
RETOUR